If he comes back its either to make money or fight top guys & reestablish his legacy as one of the greatest fighters to fight MMA. Either way he needs to be in the Octagon to do it.
Judging on his past few fights his best days are long past, he had an incredible run in Pride but time catches up with the best, plus I never felt he was comfortable within the constraints of a cage.
The top level of the Heavyweight division would be a murderers row for him to return to, especially after such a lay-off
Stay retired Fedor.

If God tells him to come out of retirement, it yet again proves that a) there is no god and b) if there is, he is a sick fucker, I mean, tells his staff to bum kids and gives them top jobs, now wants a GOAT to come back and tarnish his legacy further....nah, leave us with the good memories Feddy baby, I can still overlook the back end of the career as it stands.

One things for sure the first thing he will need is a good confidence guy as his head and confidence will be shot to pieces after them losses If he can rediscover his confidence and believe he is the greatest again then he might have a chance if not forget about it.